Does anyone know if C02 can go stale?. I know that 02 can develop an odd smell if left in the tank to long. My co2 is about a year old. My last two kegs have develop an somewhat bitter flavor. I have brewed the same style of beer, and used the same yeast. The beer tasted good when I transfered into the kegs. After letting it sit on c02 for three weeks it now has a diffrent taste.
The taste wasn't there when the co2 was new.
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CO2 does not "go stale" unless there is some chemical that can bond to it. In stell/aluminum tanks there is nothing there that would do this.
Having TOO much CO2 in suspension can cause a bitter taste though..........